The reason you are experiencing throat irritation with E-Cigarettes is because the liquid flavor is bad quality. Some sellers actually sell bad low quality liquid flavor. E-Cigs are harmful in general. In fact, they are even worse than regular cigarettes according to some sources like HuffPost. Electric Cigarettes got chemicals found in Anti-Freeze. You know how people used to think that Hookah is harmless because the water cleans and cools it. Well, people found out that Hookah is far from Harmless and also burns your throat just like E-Cigs.

A 2009 FDA analysis of e-cigarettes from two leading brands found that the samples contained carcinogens and other hazardous chemicals, including diethylene glycol, which is found in antifreeze.

http://www.huffingtonpost.com/2013/09/03/electronic-cigarettes_n_3818941.html Poison control centers have seen a rise in electric cigarette calls which means there is obviously E-Cigs are causing harm to people Poison control centers nationally have seen a 161 percent increase in calls from people with concerns over e-cigarettes. According to the U.S. Food and Drug Administration, e-cigarettes are drug-device products designed to deliver nicotine to a user in the form of a vapor. The process of smoking an e-cigarette, often known as vaping, is typically done by using a battery-operated heating element, a replaceable cartridge containing nicotine and an atomizer that uses heat to convert the contents of the cartridge into a vapor — which is then inhaled by the user. http://www.thedenverchannel.com/news/poison-control-centers-see-spike-in-e-cigarette-calls